A/C Issues - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-18-2008, 09:09 PM   #21
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Thanks for the phone conversation Bob, I appreciate the advice.


Ok I found out that the problem is with the blue rubber fitting that connects to the Freon line. I noticed when I applied constant pressure to the fitting attached to the gauge that attaches to the Freon it started to accept a charge.
I used up around 20 oz and the gauge read around 27 which is bordering the green blue line. Most importantly I went by vent temperature and stopped adding Freon when the middle vent temp was at 40 degrees at idle. While in motion it dropped as low as 37 but not for very long.

At this point in time I documented the date and will constantly monitor vent temperature to see if there are any leaks in the system.

Thanks again BOB, BILL.
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Old 04-18-2008, 10:03 PM   #22
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Quote:
Originally Posted by Echo SSEI
A/C pressure switch set points to disengauge the A/C clutch are 730 psi and 44 psi.
Bob you had this statement at the end of the chart you posted several days ago. I thought the clutch on the compressor never dissengages on the 97 model years like the 95 and older years when the A/C has been turned on?
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Old 04-18-2008, 10:37 PM   #23
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Not sure what to tell you Frank, except that that is what is indicated in the FSM (Except that I mis-typed and it is 430 and 44, NOT 730 psi). Also, this pressure switch is montoring the high side pressure in the feed line that comes from the compressor, through the condensor and evaporator and finally goes to the accumulator by the firewall. It doesn't say why it disengages the compressor clutch at those setting points but it is probably to help prevent damage to the system from pressures that are too high or too low in the high side of the system. Under normal operating conditions, it appears that the compressor clutch does not cycle, but again, in the manual it does state that if the high and low side pressures are BOTH high, the compressor clutch may cycle on and off and be noisy.
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Old 04-22-2008, 03:58 PM   #24
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If anyone see'* the R-134a freon lines needed to check pressure and recharge the system on sale, please pm me. I had to throw the one I had out since it would not unscrew from the freon can. It was one of those disposable type therefore it served it'* purpose.
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